Number of columns on the terminal (overrides termcap entry).
Directory in which to look for .screenrc.
Number of lines on the terminal (overrides termcap entry).
Screen lock program.
Used for locating programs to run.
For customizing a terminal’s
Alternate socket directory.
Alternate user screenrc file.
Default shell program for opening windows (default /bin/sh).
shell .screenrc command.
Alternate socket name. If
screen is invoked, and the environment variable
STY is set, then it creates only a window in the running
session rather than starting a new session.
Alternate system screenrc file.
Window number of a window (at creation time).